20452523809 has 2 divisors, whose sum is σ = 20452523810. Its totient is φ = 20452523808.

The previous prime is 20452523779. The next prime is 20452523831. The reversal of 20452523809 is 90832525402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17077262400 + 3375261409 = 130680^2 + 58097^2 .

It is a cyclic number.

It is not a de Polignac number, because 20452523809 - 2⁹ = 20452523297 is a prime.

It is not a weakly prime, because it can be changed into another prime (20452523899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10226261904 + 10226261905.

It is an arithmetic number, because the mean of its divisors is an integer number (10226261905).

Almost surely, 2^20452523809 is an apocalyptic number.

It is an amenable number.

20452523809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20452523809 is an equidigital number, since it uses as much as digits as its factorization.

20452523809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 20452523809 in words is "twenty billion, four hundred fifty-two million, five hundred twenty-three thousand, eight hundred nine".